Australian Dept of Defence D/l\D on the receiver

[Telembugrm]

I have a 1914 Erfurt Artillery luger which has the Australian WW2 D/l\D mark stamped on the receiver.
This would indicate it could have been issued to an Australian unit in WW2.
Whilst there are a few pictures of Officers with lugers and unit diaries show requests for lugers as a side arm (in particular independent companies, the predecessors of a Commando unit) destined for the Pacific theater, I have not seen any primary evidence for them being formally issued.
Appreciate any information.
The logic was that using the luger as the standard side arm in place of the 38 revolver would mean one less type of small arms ammunition was needed.